Standard 25*25*4MM high sensitivity GPS antennaUART/TTL,232 optional interfaceadopt KDS 0.5 PPM High Precision TCXOBuilt-in SQI FlashBuilt-in crystal and Picofarads capacitance.faster hot rootBuilt-in LNA,Low-noise amplifier1-10HzSupport AssistNow Online and AssistNow OfflineGPS,GLONASS,,SBAS(WAAS,EGNOS,MSAS,GAGAN) Hybrid EngineChip:UBX-G7020-KTC/A code,1.023MHz Streamreceive frequency:L1 (1575.42MHz)receive channel:56CHS11 SWR:less than equal 1.3S11 :50Ohm+(-)5%S21 Log :greater than equal 20.0dBS22 SWR:less than equal 1.3Location Performance:Less than 2.5m(Autonomous)(50%)Less than 2m(SBAS)rate:Less than 0.1m/sdirection:Less than 0.5 DegreesTiming accuracy:30nsReference coordinate system:-84Maximum altitude:50,000 mAcceleration:Less than 4gTracking sensitivity:-162dBmcatch sensitivity:-160dBmroot time:29s (in average)warm root time:28s(in average)hot root time:1s(in average)AGPS:colour:Main color greenMaterial:ABS+ metalPackage Contents:3 * GPS Model3 * CableOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.